package network;

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.SocketException;
import java.util.Scanner;

public class UdpEchoClient {
    private DatagramSocket socket=null;
    private String serverIP="";
    private int serverPort=0;
    public UdpEchoClient(String ip,int port) throws SocketException {
        socket=new DatagramSocket();
        serverIP=ip;
        serverPort=port;
    }

    public void start() throws IOException {
        System.out.println("客户端启动！");
        Scanner scanner=new Scanner(System.in);
        while(true)
        {
            System.out.println("-> ");
            String request=scanner.next();
            DatagramPacket requestPacket=new DatagramPacket(request.getBytes(),request.getBytes().length, InetAddress.getByName(serverIP),serverPort);
            socket.send(requestPacket);
            DatagramPacket responsePacket=new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            String response=new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.printf("%s\n",response);
        }

    }

    public static void main(String[] args) throws IOException {
        UdpEchoClient udpEchoClient=new UdpEchoClient("127.0.0.1",9090);
        udpEchoClient.start();
    }
}
